METER / GAUGE SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER ASSEMBLY

    A005GHXE02

    1. Disconnect the F1 combination meter assembly connector.

    2. Measure the voltage and resistance of the wire harness side connector.

      Terminals No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F1-39 (IG+) - Body ground P - Body ground Ignition switch signal Ignition switch off → ON Below 1 V → 11 to 14 V
      F1-40 (B) - Body ground L - Body ground Battery Always 11 to 14 V
      F1-21 (ET) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the F1 combination meter assembly connector.

    4. Measure the voltage of the wire harness side connector.

      Terminals No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F1-14 (-) - Body ground BR - Body ground High beam indicator signal (-) Always Below 1 V
      F1-19 (+) - Body ground GR - Body ground High beam indicator signal (+) High beam indicator ON → OFF 11 to 14 V → Below 1 V
      F1-31 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation
      F1-32 (CANH) - Body ground G - Body ground CAN communication line Ignition switch ON Pulse generation
      F1-13 (CHG-)*1 - Body ground L - Body ground Charge warning light signal

      Engine start

      Charge warning light ON → OFF

      		 Below 1 V → 11 to 14 V
      F1-11 (CHK) - Body ground LG - Body ground Check engine warning light signal Check engine warning light ON → OFF Below 1 V → 11 to 14 V
      F3-7 (LR) - Body ground V - Body ground Right turn signal

      Ignition switch ON

      Right turn indicator light OFF → ON

      		 Below 1 V → 11 to 14 V
      F3-13 (LL) - Body ground LG - Body ground Left turn signal

      Ignition switch ON

      Left turn indicator light OFF → ON

      		 Below 1 V → 11 to 14 V
      F3-12 (FOG)*2 - Body ground BE - Body ground Front fog signal

      Ignition switch ON

      Front fog switch OFF → ON

      		 Below 1 V → 11 to 14 V
      F3-11 (S)*3 - Body ground SB - Body ground Rear fog signal

      Ignition switch ON

      Rear fog switch OFF → ON

      		 Below 1 V → 11 to 14 V
      F1-20 (ILL+) - Body ground R - Body ground Taillight signal Light control switch OFF → ON Below 1 V → 11 to 14 V
      F3-6 (IND)*4 - Body ground LG - Body ground Tail light indicator signal Light control switch ON → OFF Below 1 V → 11 to 14 V
      F1-1 (RLMT)*5 - Body ground GR - Body ground Rear LH seat belt warning light signal Rear LH seat belt warning light ON → OFF Below 1 V → 11 to 14 V
      F1-2 (PCMT)*5 - Body ground G - Body ground Rear CENTER seat belt warning light signal Rear CENTER seat belt warning light ON → OFF Below 1 V → 11 to 14 V
      F1-3 (RRMT)*5 - Body ground B - Body ground Rear RH seat belt warning light signal Rear RH seat belt warning light ON → OFF Below 1 V → 11 to 14 V
      F1-7 (P/SB)*5 - Body ground P - Body ground Front seat inner belt assembly signal (passenger side) Front passenger seat is occupied and its seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      F1-24 (RLSB)*5 - Body ground V - Body ground Rear seat inner belt assembly signal (LH side) Rear LH seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      F1-25 (RCSB)*5 - Body ground R - Body ground Rear seat inner belt assembly signal (Center side) Rear CENTER seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      F1-26 (RRSB)*5 - Body ground BE - Body ground Rear seat inner belt assembly signal (RH side) Rear RH seat belt is unfastened → fastened Below 1 V → 11 to 14 V
      F1-16 (L) - Body ground G - Body ground Fuel level signal

      Ignition switch ON

      Fuel level is FULL → EMPTY

      		 Below 1 V → 4.5 to 9.0 V
      F1-5 (SI) - Body ground L - Body ground Speed signal (Input)

      Driving at approximately

      20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      F1-6 (+S) - Body ground SB - Body ground Speed signal (Output)

      Driving at approximately

      20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      F1-9 (S)*6 - Body ground Y - Body ground Engine oil pressure signal Engine oil pressure warning light ON → OFF Below 1 V → 11 to 14 V
      F1-27 (OILW)*7 - Body ground W - Body ground Oil level sensor signal Ignition switch ON 11 to 14V
      F1-22 (BRQ)*8 - Body ground LG - Body ground Communication line with combination meter Ignition switch ON Below 1.44 V
      F1-23 (TX+)*8 - Body ground Y - Body ground Communication line with combination meter Ignition switch ON Pulse generation
      F1-34 (TX1-) - Body ground B- Body ground Ambient temperature sensor signal Ignition switch ON 4.5 to 5.5 V
      F1-35 (TX1+) - Body ground W - Body ground Ambient temperature sensor ground Always Below 1 Ω
      F1-12 (SW) - Body ground GR - Body ground Brake fluid level warning light signal

      Ignition switch ON

      Brake fluid level warning light ON → OFF

      		 Below 1 V → 11 to 14 V
      F1-8 (S)*7 - Body ground G - Body ground Fuel filter warning switch signal Fuel filter warning light ON → OFF Below 1 V → 11 to 14 V

      • *1: for 1NZ-FE

      • *2: w/ Front Fog Light

      • *3: w/ Rear Fog Light

      • *4: w/ Daytime Running Light System

      • *5: except 1NZ-FE

      • *6: except 1ND-TV

      • *7: for 1ND-TV

      • *8: for Multi-mode Manual Transaxle

      If the result is not as specified, the combination meter assembly may have a malfunction.


      1. A005JAFE01

        Waveform 1: Using an oscilloscope

        Terminal Connections

        F1-6 (+S) and Body ground

        F1-5 (SI) and Body ground
        Tool Setting 5 V/DIV, 20 ms/DIV
        Condition Driving at approximately 20 km/h (12 mph)

        Tech Tips

        As the vehicle speed increases, the cycle of the signal waveform narrows.

  2. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    w/o Theft Deterrent System

    A005GVXE04
    Text in Illustration
    *A for LHD *B for RHD
    *1 Instrument Panel Junction Block Assembly *2

    Main Body ECU

    (Multiplex Network Body ECU)

    w/ Theft Deterrent System

    A005KMOE03
    Text in Illustration
    *1 Instrument Panel Junction Block Assembly *2

    Main Body ECU

    (Multiplex Network Body ECU)

    1. Remove the main body ECU (multiplex network body ECU).

    2. Measure the resistance and voltage between each terminal of the wire harness side connectors and body ground.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      MB-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω
      MB-29 (ACC) - Body ground None - Body ground Ignition power supply (ACC signal) Ignition switch ACC 11 to 14 V
      MB-30 (BECU) - Body ground None - Body ground +B (power system signal system) power supply Always 11 to 14 V
      MB-31 (ALTB) - Body ground None - Body ground +B (power system alternator system) power supply Always 11 to 14 V
      MB-32 (IG) - Body ground None - Body ground Ignition power supply (IG signal) Ignition switch ON 11 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Install the main body ECU (multiplex network body ECU).

    4. Measure the voltage between each terminal of the wire harness side connectors and body ground.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3A-28 - Body ground R - Body ground Parking brake signal Parking brake warning light ON → OFF Below 1 V → 11 to 14 V
      3D-34 (DBKL) - Body ground W - Body ground Front seat inner belt assembly signal (driver side) Driver seat belt warning light OFF → ON Below 1 V → 11 to 14 V
      F76-13 (CANL) - Body ground W - Body ground CAN communication line Ignition switch ON Pulse generation
      F76-14 (CANH) - Body ground R - Body ground CAN communication line Ignition switch ON Pulse generation

      If the result is not as specified, there may be a malfunction in the wire harness.

  3. COMBINATION METER INTERNAL CIRCUIT

    A005MGWE02
    A005JKHE02
    A005H28E02
    Connectors
    Terminal No. Wire Harness Side
    F1 1 Telltale light assembly (Rear Seat LH)*1
    2 Telltale light assembly (Rear Seat CENTER)*1
    3 Telltale light assembly (Rear Seat RH)*1
    5 Brake actuator assembly (skid control ECU)
    6 Other ECU
    7 Occupant detection sensor and Front seat inner belt assembly (Front passenger side)
    8 Level warning switch*2
    9 Engine oil pressure switch assembly*3
    11 ECM
    12 Brake fluid level warning switch
    13 Generator*4
    16 Fuel sender gauge assembly
    19 H-LP LH HI fuse
    20 Panel relay*5
    21 Body ground
    22 TCM*6
    23 TCM*6
    24 Rear seat inner belt assembly LH*1
    25 Rear seat inner belt assembly CENTER*1
    26 Rear seat inner belt assembly RH*1
    27 Engine oil level sensor assembly*2
    31 CAN communication line
    32 CAN communication line
    34 Thermistor assembly
    35 Thermistor assembly
    39

    IG2 relay*7

    Eco run vehicle converter assembly*8
    40 Battery
    F3 1 Battery
    3 Hazard warning signal switch assembly
    4 Headlight leveling ECU assembly*11
    6 Main body ECU (Multiplex network body ECU)*5
    7 Turn signal light RH
    9 Headlight dimmer switch assembly (Turn signal switch)
    10 Headlight dimmer switch assembly (Turn signal switch)
    11 FOG RR relay*9
    12 FR FOG relay*10
    13 Turn signal light LH

    • *1: for 1NR-FE or 1ND-TV

    • *2: for 1ND-TV

    • *3: except 1ND-TV

    • *4: for 1NZ-FE

    • *5: w/ Daytime Running Light System

    • *6: for Multi-mode manual transaxle

    • *7: w/o Stop and Start System

    • *8: w/ Stop and Start System

    • *9: w/ Rear Fog Light

    • *10: w/ Front Fog Light

    • *11: w/ HID HeadLight